Помогите доделать task tracker

const form = document.querySelector('#form');
const input = document.querySelector('#input');
const board = document.querySelector('#board');

// create task list
let taskList = [];

if (!localStorage.taskList) {
  taskList = [];
} else {
  taskList = JSON.parse(localStorage.getItem('taskList'));
}

// create task
class Task {
  constructor(description) {
    this.description = description;
    this.status = false;
    this.date = new Date().toLocaleString();
    this.timer = '00:00:00';
  }
}

// add task event
form.addEventListener('submit', (e) => {
  e.preventDefault();
  taskList.push(new Task(input.value));
  input.value = '';

  addTaskToHtml();
  updateLocalStorage();
});

// functions:
// update local stptage
function updateLocalStorage() {
  localStorage.setItem('taskList', JSON.stringify(taskList));
}

// create task template
function createTask(item, idx) {
  return `
    <div class="${item.status === false ? 'task__item paused' : 'task__item'}">
      <div class="task__item--name">${
        item.description ? item.description : item.date
      }</div>
      <div class="task__item--tracking">
        <span id="timer" class="task__item--tracking--timer">${
          item.timer
        }</span>
        <span id="startStop" class="task__item--tracking--start-stop" onclick="changeStatus(this, ${idx})"></span>
        <span id="deleteTask" class="task__item--tracking--delele" onclick="deleteTask(${idx})"><i class="far fa-trash-alt"></i></span>
      </div>
    </div>
  `;
}

// add task to html
function addTaskToHtml() {
  board.innerHTML = '';

  if (taskList.length > 0) {
    taskList.forEach((item, idx) => {
      board.innerHTML += createTask(item, idx);
    });
  }
}

addTaskToHtml();

// delete Task
function deleteTask(idx) {
  taskList.splice(idx, 1);

  updateLocalStorage();
  addTaskToHtml();
}

// complete
function changeStatus(elem, idx) {
  taskList[idx].status = !taskList[idx].status;
  const element = elem.parentNode.parentNode;

  if (taskList[idx].status) {
    element.classList.remove('paused');
  } else {
    element.classList.add('paused');
  }

  updateLocalStorage();
  addTaskToHtml();
  // startStop();
}

// VARIABLES
$text: #000;
$bg: #f4f4f6;
$text-light: #b0a3a7;
$red: #be0909;

// MAIN STYLES
* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}

html {
  overflow-x: hidden;
}

body {
  height: 100vh;
  margin: 0;

  font-family: 'Roboto', sans-serif;
  font-size: 16px;
  font-weight: 500;
  color: $text;

  background-color: $bg;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0;
  padding: 0;
}

ul {
  list-style: none;
}

a {
  text-decoration: none;
  font-weight: 500;
}

/* CONTAINER */
.container {
  width: 100%;
  max-width: 1170px;
  margin: 0 auto;
  padding: 0 15px;

  display: flex;
  justify-content: center;
}

// APP
.app {
  text-align: center;
  width: 560px;
  display: flex;
  flex-direction: column;
  justify-content: center;

  margin-top: 150px;

  &__title {
    color: $text-light;
    font-size: 46px;
    font-weight: 300;

    & span {
      color: $text;
      font-weight: 700;
    }
  }

  &__add {
    margin-top: 50px;
    width: 100%;
  }

  &__tasks {
    margin-top: 25px;
    text-align: left;
  }
}

.form {
  display: flex;
  flex-direction: column;
  align-items: center;

  &__input {
    width: 100%;
    padding: 15px 25px;

    outline: none;
    border: 0;
    border: 1px solid $text-light;
    border-radius: 25px;
    background-color: $bg;

    font-size: 16px;
    color: $text;
  }

  &__btn {
    margin-top: 25px;
    height: 40px;
    width: 40px;

    line-height: 40px;
    font-size: 30px;

    color: lighten($text, 30);

    border: 1px solid $text-light;
    background-color: $bg;

    cursor: pointer;
  }
}

.task__item {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  align-items: center;
  padding: 25px;
  margin-top: 5px;

  background: darken($color: $bg, $amount: 5);
  border-radius: 15px;

  color: #2e8b57;

  &--tracking {
    display: flex;
    align-items: center;

    & span {
      margin-left: 20px;
      cursor: pointer;

      font-size: 20px;

      &:nth-child(1) {
        margin-left: 0;
        font-size: 16px;

        cursor: auto;
      }
      &:nth-child(2) {
        border: 0;
        background: transparent;
        box-sizing: border-box;
        width: 0;
        height: 20px;

        border-color: transparent transparent transparent $text;
        transition: 100ms all ease;
        cursor: pointer;

        // play state
        border-style: solid;
        border-width: 10px 0 10px 15px;
      }
      &:nth-child(3) {
        color: $red;
        font-size: 19px;
      }
    }
  }
}

.task__item.paused {
  .task__item--tracking--start-stop {
    height: 15px;
    border-style: double;
    border-width: 0px 0px 0px 15px;
  }
}

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Task Tracker</title>
    <!-- GOOGLE ICONS -->
    <link
      rel="stylesheet"
      href="https://pro.fontawesome.com/releases/v5.10.0/css/all.css"
      integrity="sha384-AYmEC3Yw5cVb3ZcuHtOA93w35dYTsvhLPVnYs9eStHfGJvOvKxVfELGroGkvsg+p"
      crossorigin="anonymous"
    />

    <!-- GOOGLE FONTS -->
    <link rel="preconnect" href="https://fonts.googleapis.com" />
    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
    <link
      href="https://fonts.googleapis.com/css2?family=Roboto:wght@300;500;700&display=swap"
      rel="stylesheet"
    />

    <!-- CSS -->
    <link rel="stylesheet" href="assets/css/style.css" />
  </head>
  <body>
    <div class="container">
      <div class="app">
        <div class="app__title"><span>Tasks</span> Lists</div>
        <div class="app__add">
          <form id="form" class="form" action="/">
            <input id="input" class="form__input" type="text" />
            <button id="addBtn" class="form__btn">+</button>
          </form>
        </div>

        <div id="board" class="app__tasks"></div>
      </div>
    </div>

    <!-- JavaScript -->
    <script src="./assets/js/app.js"></script>
  </body>
</html>